In a photoelectric experiment a parallel beam of monochromatic light with power of 200W is incident on a perfectly absorbing cathode of work function 6.25eV. The frequency of light is just above the threshold frequency so that the photoelectrons are emitted with negligible kinetic energy. Assume that the photoelectron emission efficiency is 100%. A potential difference of 500V is applied between the cathode and the anode. All the emitted electrons are incident normally on the anode and are absorbed. The anode experiences a force due to the impact of the electrons. The value of n is_________. Mass of the electron and .
power = nhv n= number of photons per second
Since KE= 0,
As photon just above threshold frequency is zero and they are accelerated by
potential difference of 500V.
Since efficiency is 100%, number of electrons ejected = number of photons per second
As photon is completely absorbed force exerted
Thus, n = 24
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Light of wavelength falls on a cathode plate inside a vacuum tube as shown in the figure. The work function of the cathode surface is and the anode is a wire mesh of conducting material kept at a distance d from the cathode. A potential difference V is maintained between the electrodes. If the minimum de Broglie wavelength of the electrons passing through the anode is , Which of the following statement(s) is(are)true?
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